body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.container h1 {
    margin-bottom: 20px;
}

.container input[type="text"],
.container input[type="password"] {
    width: calc(100% - 20px);
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
}

.container input[type="submit"] {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.container input[type="submit"]:hover {
    background-color: #0056b3;
}

.error-message {
    color: #dc3545;
    margin-top: 10px;
}

.success-message {
    color: #28a745;
    margin-top: 10px;
}

.hidden {
    display: none !important;
}

.key-status {
    font-size: 0.9em;
    color: #2ecc71;
    margin-bottom: 10px;
}

.change-key-btn {
    background: none;
    border: none;
    color: #3498db;
    text-decoration: underline;
    cursor: pointer;
    padding: 5;
    font-size: 1em;
}